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DTSTART;TZID=Europe/Paris:20260505T110000
DTEND;TZID=Europe/Paris:20260505T123000
DTSTAMP:20260504T072023Z
CREATED:20260504T072023Z
LAST-MODIFIED:20260504T072023Z
UID:12229-1777978800-1777984200@fermi.univ-tlse3.fr
SUMMARY:An optical lattice clock with a bosonic isotope of mercury. - (Ashley BEGUIN / LCAR / Seminar). - 5/05/2026\, 11H
DESCRIPTION:Séminaire LCAR \nAshley BEGUIN\, LTE\, Observatoire de Paris\, Université PSL\, Sorbonne Université\, Université de Lille\, LNE \nSummary\nSince 1967\, time has been defined through atomic transition frequencies\, establishing atomic clocks as fundamental tools for science and technology. More recently\, optical atomic clocks have surpassed historical atomic microwave clocks\, reaching uncertainties close to 10⁻¹⁸ and enabling both applied and fundamental investigations. At this level of performance\, atomic clocks serve as sensitive probes for a wide range of applications\, such as chronometric geodesy\, tests of General Relativity\, searches for physics beyond the Standard Model\, and the prospective redefinition of the SI second [1]. In addition\, frequency ratio measurements would provide powerful tools to constrain possible variations of fundamental constants\, such as the fine-structure constant α and the proton-to-electron mass ratio [2]. \nAmong neutral atoms\, mercury offers several attractive features for an optical lattice clock\, including a low sensitivity to blackbody radiation—16 times lower than ytterbium and 30 times lower than strontium—and a relatively high vapor pressure at room temperature. To date\, only the fermionic isotope ¹⁹⁹Hg has been used in mercury clocks. However\, the limited lifetime of its excited state constrains the performance achievable with the next generation of ultrastable lasers. In contrast\, bosonic isotopes offer a way to overcome this limitation\, as they allow for much longer interrogation times\, with the normally forbidden ¹S₀–³P₀ transition made accessible through a quenching scheme using a strong external magnetic field [3]. \nHere\, we present the first ¹⁹⁸Hg optical lattice clock and its comparison with a local state-of-the-art ⁸⁷Sr optical lattice clock. This clock is estimated to operate with a relative frequency stability already as low as 6 × 10⁻¹⁶/√(τ/s)\, and the 198Hg/87Sr optical frequency ratio could be determined for the first time with a preliminary total relative systematic uncertainty of 6.9 × 10⁻¹⁶ [4]. With this magnetically induced transition\, both the quadratic Zeeman shift (QZS) and the probe light shift (PLS) play indeed a significant role in the total uncertainty budget. Careful calibration and optimized experimental conditions can reduce the QZS uncertainty below the 10⁻¹⁷ level\, whereas the PLS remains a major limitation under our current experimental setup. We are now working on implementing hyper-Ramsey interrogation [5] to suppress the PLS uncertainty to lower levels. Future steps will focus on further improving the clock stability by employing repumping techniques for normalized detection and achieving lower atomic temperatures through a sideband cooling scheme. \n\n[1] W. F. McGrew et al\, Nature\, 564\, 87 (2018). A. D. Ludlow et al\, Rev. Mod. Phys.\, 87\, 637 (2015). S. Bize\, Comptes Rendus Physique\, 20\, 153 (2019).\n[2] Uzan J.P.\, Living Rev. Relativ. 14 (2011) 2.\n[3] A. V. Taichenachev et al\, Phys. Rev. Lett.\, 96\, 083001 (2006).\n[4] C. Zyskind\, et al.\, arXiv:2512.04920 (2025).\n[5] V. I. Yudin\, et al.\, Phys. Rev. A 82\, 011804(R) (2010).
URL:https://fermi.univ-tlse3.fr/event/an-optical-lattice-clock-with-a-bosonic-isotope-of-mercury-ashley-beguin-lcar-seminar-5-05-2026-11h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LCAR,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260505T140000
DTEND;TZID=Europe/Paris:20260505T153000
DTSTAMP:20260504T072414Z
CREATED:20260504T075434Z
LAST-MODIFIED:20260504T072414Z
UID:12085-1777989600-1777995000@fermi.univ-tlse3.fr
SUMMARY:Comment la géométrie et la topologie rendent les matériaux rigides… ou étonnamment souples. - (Christian D Santangelo / LPT / Seminar). -5/05/2026\, 14H
DESCRIPTION:Séminaire LPT \nChristian D Santangelo (Université de Syracuse) \nSeminar LPT\, 5/05/2026\, 14H\, 3R4\, salle de conférence\n\nSummary\nThe materials of biology\, from sharkskin to cartilage to wood\, regularly out-perform their synthetic equivalents. Organisms can achieve this because their materials have precise geometric structures that endow them with tailored mechanical properties that can often be changed in situ. It has recently become possible to fabricate comparable structures\, but we still seem to understand little about how geometry and mechanics are intertwined. \nThis talk will discuss why this is a hard problem (NP-hard actually)\, and highlight new work by my group and collaborators that are starting to unveil new connections between geometry and mechanics. This new understanding has allowed us to design materials that can change their mechanical properties\, changing from rigid to floppy due to the imposition of internal stresses.
URL:https://fermi.univ-tlse3.fr/event/tba-christian-d-santangelo-lpt-seminar-5-05-2026-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260507T110000
DTEND;TZID=Europe/Paris:20260507T120000
DTSTAMP:20260504T072537Z
CREATED:20260503T083622Z
LAST-MODIFIED:20260504T072537Z
UID:12109-1778151600-1778155200@fermi.univ-tlse3.fr
SUMMARY:Réseaux de tenseurs pour des géométries arbitraires : applications aux systèmes frustrés et à la simulation de circuits quantiques. - (Saeed Jahromi / LPT / Seminar). -7/05/2026\, 14H
DESCRIPTION:Séminaire LPT \nSaeed Jahromi (IASBS) \nSeminar LPT\, 7/05/2026\, 11H\, 3R4\, salle de conférence \nSummary\nIn this talk\, I will present recent advances in tensor network (TN) methods for the accurate simulation of quantum many-body systems on arbitrary geometries. In particular\, I will discuss how to overcome the challenges of applying TN methods to different lattice structures and dimensions. I will then present three representative applications: (i) the Heisenberg antiferromagnet on the square–kagome lattice\, where frustration stabilizes nontrivial valence-bond crystal phases\, (ii) the Kitaev–Heisenberg model on the bilayer honeycomb lattice\, highlighting competing magnetic and quantum spin liquid phases\, and (iii) tensor-network-based simulation of quantum circuits relevant to recent IBM experiments.
URL:https://fermi.univ-tlse3.fr/event/tba-csaeed-jahromi-lpt-seminar-7-05-2026-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260507T110000
DTEND;TZID=Europe/Paris:20260507T123000
DTSTAMP:20260504T072350Z
CREATED:20260503T074751Z
LAST-MODIFIED:20260504T072350Z
UID:12083-1778151600-1778157000@fermi.univ-tlse3.fr
SUMMARY:Existing experiments suffice to indirectly verify the quantum essence of gravity. - ( Martin Plavala/ LCAR / Seminar). - 7/05/2026\, 11H
DESCRIPTION:Séminaire LCAR \nMartin Plavala\,  Institut für Theoretische Physik\, Leibniz Universität Hannover\, Hannover\, Germany \nSummary\nThe gravity-mediated entanglement experiments employ concepts from quantum information to argue that if entanglement due to gravitational interaction is observed\, then gravity cannot be described by a classical system. However\, the proposed experiments remain beyond out current technological capability\, with optimistic projections placing the experiment outside of short-term future. Here we argue that current matter-wave interferometers are sufficient to indirectly prove that gravitational interaction creates entanglement between two systems. Specifically\, we prove that if we experimentally verify the Schrödinger equation for a single delocalized system interacting gravitationally with an external mass\, then\, under one of two reasonable assumptions\, the time evolution of two delocalized systems will lead to gravity-mediated entanglement.
URL:https://fermi.univ-tlse3.fr/event/existing-experiments-suffice-to-indirectly-verify-the-quantum-essence-of-gravity-martin-plavala-lcar-seminar-7-05-2026-11h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LCAR,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260512T140000
DTEND;TZID=Europe/Paris:20260512T150000
DTSTAMP:20260422T070538Z
CREATED:20260412T083744Z
LAST-MODIFIED:20260422T070538Z
UID:11992-1778594400-1778598000@fermi.univ-tlse3.fr
SUMMARY:Dynamique quantique de la chiralité d’une paroi de domaine magnétique mésoscopique. - (Oleksiy Kolezhuk / LPT / Seminar). - 12/05/2026\, 14H
DESCRIPTION:Séminaire LPT \nOleksiy Kolezhuk\, (Institut du Magnétisme\, ANS\, Ukraine) \nSeminar LPT\, 12/05/2026\, 14H\, 3R4\, salle de conférence \nSummary\nWe study the quantum dynamics of the internal chirality degree of freedom of a mesoscopic domain wall pinned inside a quasi-one-dimensional fixture. It is shown that weak spin-polarized current excites Bloch oscillations of the domain wall angular rotation velocity\, with the oscillation frequency proportional to the current\, modulated by a much higher magnon-range frequency. In addition to that\, the Wannier-Stark localization effects enable controlled switching between different chiral states\, suppressing inertial effects characteristic for the classical regime. \nThe current density required for the chirality manipulation can be significantly lower compared to the classical regime. We also show that for recently discovered novel class of magnetic materials — altermagnets — chirality switching can be driven by the usual (non-spin-polarized)\ncurrent. \n[1] O. Kolezhuk\, R. Teslia\, I. Buryak\, and O. Gomonay\, Phys. Rev. B 109\, 134418 (2024)
URL:https://fermi.univ-tlse3.fr/event/dynamique-quantique-de-la-chiralite-dune-paroi-de-domaine-magnetique-mesoscopique-oleksiy-kolezhuk-lpt-seminar-12-05-2026-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260522T140000
DTEND;TZID=Europe/Paris:20260522T153000
DTSTAMP:20260522T090126Z
CREATED:20260522T090057Z
LAST-MODIFIED:20260522T090126Z
UID:12254-1779458400-1779463800@fermi.univ-tlse3.fr
SUMMARY:Harnessing AI to perform multidimensional sensing in experiments with quantum degenerate atoms. - (Murray Holland/ LCAR / Seminar). - 22/05/2026\, 14H
DESCRIPTION:Séminaire LCAR \nMurray Holland\, University of Colorado Boulder – JILA
URL:https://fermi.univ-tlse3.fr/event/harnessing-ai-to-perform-multidimensional-sensing-in-experiments-with-quantum-degenerate-atoms-murray-holland-lcar-seminar-22-06-2026-14h/
LOCATION:salle de séminaire 3ème étage\, Bâtiment 3r1 Université Toulouse III\, Toulouse\, 31400\, France
CATEGORIES:Events,LCAR,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260526T140000
DTEND;TZID=Europe/Paris:20260526T150000
DTSTAMP:20260522T083425Z
CREATED:20260522T064321Z
LAST-MODIFIED:20260522T083425Z
UID:12114-1779804000-1779807600@fermi.univ-tlse3.fr
SUMMARY:Fermi-Hubbard SU(N) et au-delà : brisure de la symétrie ZL dans des boîtes quantiques à température nulle et finie. - (Loïc Herviou / LPT / Seminar). -26/05/2026\, 14H
DESCRIPTION:Séminaire LPT \nLoïc Herviou (LPMMC) \nSeminar LPT\, 26/05/2026\, 14H\, 3R4\, salle de conférence \nSummary\nLarge symmetries are both a curse (larger Hilbert space) and a boon (large irreducible representations) for numerical studies.\nIn this presentation\, I will discuss the method introduced by T. Botzung and P. Nataf in Phys. Rev. Lett. 132 (2023) to tackle optimally Fermi-Hubbard models with SU(N) symmetries. I will exemplify the drastic speedups in an unconventional thermodynamic limit of both large number of colors and particles\, and small number of sites. Using a combination of numerical simulations and analytical computation\, we get the exact\, finite and zero temperature\, phase diagrams with systems including several thousand particles.\nIf time allows\, we will discuss generalization of this approach to other Lie groups and models.
URL:https://fermi.univ-tlse3.fr/event/tba-loic-herviou-lpt-seminar-26-05-2026-14h/
LOCATION:Salle de conférence\, Bâtiment 3R4
CATEGORIES:Events,LPT,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260528T140000
DTEND;TZID=Europe/Paris:20260528T153000
DTSTAMP:20260522T072941Z
CREATED:20260521T072530Z
LAST-MODIFIED:20260522T072941Z
UID:12234-1779976800-1779982200@fermi.univ-tlse3.fr
SUMMARY:Microwave-optical conversion via Rydberg excitons. - ( Liam Gallagher / LPCNO / Seminar). - 28/05\, 14H
DESCRIPTION:Séminaire du LPCNO \nLiam Gallagher\, Durham University\, UK \nSeminar LPCNO\, 28/05/2026\, 14H
URL:https://fermi.univ-tlse3.fr/event/microwave-optical-conversion-via-rydberg-excitons-liam-gallagher-lpcno-seminar-16-04-2026-14h/
LOCATION:Salle 220\, LPCNO\, INSA – LPCNO : 135 avenue de Rangueil\, toulouse\, 31077\, France
CATEGORIES:Events,LPCNO,Seminars
END:VEVENT
BEGIN:VEVENT
DTSTART;TZID=Europe/Paris:20260529T110000
DTEND;TZID=Europe/Paris:20260529T123000
DTSTAMP:20260522T083152Z
CREATED:20260520T072641Z
LAST-MODIFIED:20260522T083152Z
UID:12240-1780052400-1780057800@fermi.univ-tlse3.fr
SUMMARY:The search of efficient light: Past\, Present\, Future - (Claude WEISBUCH / Seminar / SFP). - 29/05/2026\, 11H
DESCRIPTION:Séminaire SFP \nClaude WEISBUCH Université de Californie et de l’École polytechnique \nThe search of efficient light: Past\, Present\, Future \n 
URL:https://fermi.univ-tlse3.fr/event/the-search-of-efficient-light-past-present-future-claude-weisbuch-seminar-sfp-29-05-2026-11h/
LOCATION:salle de séminaires au Dépt de Génie Physique de l’INSA\, 2ème
CATEGORIES:Events,Seminars,SFP / SFC
ATTACH;FMTTYPE=image/jpeg:https://fermi.univ-tlse3.fr/wp-content/uploads/2026/05/SFP_Weisbuch_29mai26.jpg
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